How do I get a glowing line via textures or materials?
If you want to do this relatively easily and for certain edges, select the appropriate faces in edit mode and click EDIT->Mesh->Faces->Wire Frame on a duplicate of your original model.

Assign new materials with emission. I recommend just doing a solid material and join the models back together (I really usually work in Cycles, and if doing so you can use a simple Emission shader since Blender Internal doesn't really like emitting from materials in my experience). This adds a few vertices, depending on how smooth you want your outlines to be, but I've found that usually they can be pretty simple. You wind up with something like this: